Nanoparticle based one dimensional photonic crystals are porous optical lattices that display environmentally responsive
optical properties. Herein we will demonstrate that they can be used to build optical micro-resonators in which this
response is further enhanced. Its versatility is proved by showing their capacity to host different types of light emitters,
with irregular shapes, like rare earths based nanophosphors. The effect of the photonic nanostructure on the emission
spectra of embedded optically active nanoparticles is studied. Narrow luminescence bands, typical of rare-earth ions, can
be enhanced or reduced in selected and tuneable wavelength ranges, by precise control of the spectral features of cavity
modes. We will provide experimental evidence of the strong changes of the optical response caused by environmental
changes, which allows us to propose these structures as base materials for the optical detection of liquids and gases.
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